MODULARITY is an important enabling technology for knowledge repositories and collaborative knowledge development environments. In formal and applied ontology, modularity is central to reducing the complexity of designing and understanding ontologies, and to facilitating ontology verification, reasoning, maintenance and integration.

This workshop continues a series of successful events that have been an excellent venue for practitioners and researchers to discuss latest and current work on theoretical and practical aspects of modularity in ontologies, bringing together an interdisciplinary crowd of researchers from various subareas of AI spanning knowledge representation, reasoning and logic (description logics, first-order logics, context-based reasoning, rule-based reasoning, automated theorem proving) and web and knowledge-based repositories and information systems (ontologies, semantic web, linked data) as well as researchers from philosophy, logic, cognitive science, and linguistics and from various application domains.

Topics of interest to the workshop are modularity in ontologies in the broadest sense. Submissions are welcome irrespective of the ontology language of interest (ranging from informal ontologies such as taxonomies, glossaries, folksonomies, and conceptual models, to formal ontology specified in languages such as RDF, OWL, first-order logic, Common Logic). Papers may touch on any aspect of modularity, including but not limited to:

* Analysis and evaluation: case studies or other analyses of modularizations; quantitative and qualitative ways to measure adequacy of a modularization; comparison of modularizations with respect to philosophical, logical, reasoning, cognitive, or social aspects.

* Work on closely related approaches: ontology content patterns; versioning and evolution of ontologies; context-based reasoning; and modularity issues as they arise in Big Data and Linked Data.

We highly value contributions from all perspectives, including those with a focus on computational, philosophical, cognitive, linguistic, and social aspects. Additionally, contributions that deal with modularity as it arises in specific applications or domains is of interest. We particularly encourage submissions that apply methods beyond classical knowledge representation, such as machine learning and natural language processing approaches, to help further the understanding of modularity.

The workshop will be open to all attendants of IJCAI'15 and its other workshops. At least one author of each accepted paper must register for the workshop and present the paper.

We welcome submissions on modularity in a broad sense. The workshop is open to papers of theoretical or practical nature from various disciplines. Submissions can be long papers (up to 8 pages) or short papers (up to 4 pages), formatted using the AAAI style according to the instructions at http://www.aaai.org/Publications/Author/author.php, prepared in PDF format and submitted no later than the submission deadline, through the EasyChair Submission System (see http://www.easychair.org/conferences/?conf=womo2015).

Submitted papers will be peer-reviewed by members of the program committee. Accepted papers will be made available in the proceedings to be published electronically in the CEUR Workshop Proceedings series (see http://www.ceur-ws.org). The proceedings from the last three editions of WoMO are available at http://ceur-ws.org/Vol-875/, http://ceur-ws.org/Vol-1081/, http://ceur-ws.org/Vol-1248/.